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Core PHP Programming: Using PHP to Build Dynamic Web Sites
book

Core PHP Programming: Using PHP to Build Dynamic Web Sites

by Leon Atkinson
August 2000
Intermediate to advanced
800 pages
13h 15m
English
Pearson
Content preview from Core PHP Programming: Using PHP to Build Dynamic Web Sites

Recursion

Your functions may make calls to other functions, and they may also make calls to themselves. The process of a function calling itself is recursion. This circular definition usually leads to elegant algorithms. The problem is broken down into a small task that's repeated many times.

Recursive definitions are common in mathematics. Consider this definition of an integer: the sum or difference between one and any other integer, with one being an integer. Is three an integer? Yes, because one plus one must be an integer, which is two. And the sum of one and two must also be an integer.

Recursion is a difficult concept to understand, but it usually leads to clearcode. Take a look at Listing 4.7. The function checkInteger takes a number ...

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Publisher Resources

ISBN: 0130893986Purchase book